docs: def get_lowest_values(self, count):
          """Get a list of the the x lowest values of the Data Collection and their indices.
  
          This is useful for situations where one needs to know the times of
          the year when the smallest values of a data collection occur.
  
          Args:
              count: Integer representing the number of lowest values to account for.
  
          Returns:
              highest_values: The n lowest values in data list, ordered from
                  lowest to lowest.
              lowest_values_index: Indicies of the n lowest values in data
                  list, ordered from lowest to lowest.
          """
          count = int(count)
          assert count <= len(self._values), \
              'count must be <= to Data Collection len. {} > {}.'.format(
                  count, len(self._values))
          assert count > 0, \
              'count must be greater than 0. Got {}.'.format(count)
          lowest_values = sorted(self._values)[0:count]
          lowest_values_index = sorted(list(xrange(len(self._values))),
                                       key=lambda k: self._values[k])[0:count]
          return lowest_values, lowest_values_index